I've seen a ton of videos lately of parents playing jokes on their kids that they've eaten their candy. Or gave them a Christmas present early & its a terrible present. But I think you could possibly give these kids anything & they won't turn into monsters on you.
Back when I worked at the Mall I myself had two encounters with crazy Black Friday Shoppers. The first was a fight that broke out over a men's button down (seriously), that was quickly broken up because one of the ladies realized there was another one on a different shelf.